scholarly journals The fibula and talus position difference in functional and mechanical ankle instability: MRI findings

2021 ◽  
Vol 29 (1) ◽  
pp. 230949902098457
Author(s):  
Chengjie Yuan ◽  
Genrui Zhu ◽  
Zhifeng Wang ◽  
Chen Wang ◽  
Xu Wang ◽  
...  
Keyword(s):  
Healthy Volunteers ◽  
Ankle Instability ◽  
Medial Malleolus ◽  
Mechanical Instability ◽  
Mri Findings ◽  
Functional Instability ◽  
Post Hoc Analysis ◽  
Ankle Stability ◽  
Post Hoc

Purpose: This study aimed to use MRI to evaluate the fibula and talus position difference in functional and mechanical ankle stability patients. Methods: 61 and 68 patients with functional and mechanical instability, and 60 healthy volunteers were involved. Based on the axial MRI images, the rotation of the talus was identified through the Malleolar Talus Index (MTI). The position relative to the talus (Axial Malleolar Index, AMI) and medial malleolus (Intermalleolar Index, IMI) were used to evaluated the displacement of the fibula. Results: Post hoc analysis showed that the values of malleolar talus index was significantly larger among mechanical instability (89.18° ± 2.31°) than that in functional instability patients (86.55° ±61.65°, P < 0.001) and healthy volunteers (85.59° ± 2.42°, P < 0.001). The axial malleolar index of the mechanical instability patients (11.39° ± 1.41°) were significantly larger than healthy volunteers (7.91° ± 0.83°) (P < 0.0001). There were no statistically significant differences in the above three indexes between the functional instability patients and healthy volunteers. Conclusion: The functional instability patients didn’t have a posteriorly positioned fibula and an internally rotated talus. The malleolar talus index was significantly larger among mechanical instability patients than that in functional instability patients. Increased malleolar talus index may become a new indirect MRI sign for identifying functional and mechanical instability patients.

scholarly journals Chronic Ankle Instability: Evolution of the Model

2011 ◽  
Vol 46 (2) ◽  
pp. 133-141 ◽  
Author(s):  
Claire E. Hiller ◽  
Sharon L. Kilbreath ◽  
Kathryn M. Refshauge
Keyword(s):  
Ankle Instability ◽  
Cross Sectional Study ◽  
Chronic Ankle Instability ◽  
Community Dwelling ◽  
Control Group ◽  
Mechanical Instability ◽  
Cross Sectional ◽  
Functional Instability ◽  
Proposed Model ◽  
And Inversion

Abstract Context: The Hertel model of chronic ankle instability (CAI) is commonly used in research but may not be sufficiently comprehensive. Mechanical instability and functional instability are considered part of a continuum, and recurrent sprain occurs when both conditions are present. A modification of the Hertel model is proposed whereby these 3 components can exist independently or in combination. Objective: To examine the fit of data from people with CAI to 2 CAI models and to explore whether the different subgroups display impairments when compared with a control group. Design: Cross-sectional study. Patients or Other Participants: Community-dwelling adults and adolescent dancers were recruited: 137 ankles with ankle sprain for objective 1 and 81 with CAI and 43 controls for objective 2. Intervention(s): Two balance tasks and time to recover from an inversion perturbation were assessed to determine if the subgroups demonstrated impairments when compared with a control group (objective 2). Main Outcome Measure(s): For objective 1 (fit to the 2 models), outcomes were Cumberland Ankle Instability Tool score, anterior drawer test results, and number of sprains. For objective 2, outcomes were 2 balance tasks (number of foot lifts in 30 seconds, ability to balance on the ball of the foot) and time to recover from an inversion perturbation. The Cohen d was calculated to compare each subgroup with the control group. Results: A total of 56.5% of ankles (n = 61) fit the Hertel model, whereas all ankles (n = 108) fit the proposed model. In the proposed model, 42.6% of ankles were classified as perceived instability, 30.5% as recurrent sprain and perceived instability, and 26.9% as among the remaining groups. All CAI subgroups performed more poorly on the balance and inversion-perturbation tasks than the control group. Subgroups with perceived instability had greater impairment in single-leg stance, whereas participants with recurrent sprain performed more poorly than the other subgroups when balancing on the ball of the foot. Only individuals with hypomobility appeared unimpaired when recovering from an inversion perturbation. Conclusions: The new model of CAI is supported by the available data. Perceived instability alone and in combination characterized the majority of participants. Several impairments distinguished the sprain groups from the control group.

scholarly journals Effects of propofol and dexmedetomidine with and without remifentanil on serum cytokine concentrations in healthy volunteers: a post hoc analysis

2020 ◽  
Vol 125 (3) ◽  
pp. 267-274
Author(s):  
Dirk J. Bosch ◽  
Matijs V. Meurs ◽  
Rianne M. Jongman ◽  
Peter Heeringa ◽  
Wayel H. Abdulahad ◽  
...  
Keyword(s):  
Healthy Volunteers ◽  
Serum Cytokine ◽  
Post Hoc Analysis ◽  
Post Hoc

Ankle Joint Control in People with Chronic Ankle Instability During Run-and-cut Movements

2018 ◽  
Vol 39 (11) ◽  
pp. 853-859 ◽  
Author(s):  
Patrick Fuerst ◽  
Albert Gollhofer ◽  
Heinz Lohrer ◽  
Dominic Gehring
Keyword(s):  
Ankle Joint ◽  
Ankle Instability ◽  
Dynamic Change ◽  
Frontal Plane ◽  
Chronic Ankle Instability ◽  
Joint Control ◽  
Mechanical Instability ◽  
Functional Instability ◽  
Average Maximum ◽  
Underlying Mechanisms

AbstractDespite a considerable amount of research, the deficits causing recurrent sprains in people with chronic ankle instability are still unclear. Changes in frontal plane kinematics and decreased peroneal activation have been proposed as potential underlying mechanisms, but whether people with ankle instability show deficits in control of injury-relevant movements is not well understood. Therefore, the purpose of the present study was to analyse ankle joint kinematics and kinetics as well as neuromuscular activation during dynamic change-of-direction movements. Eighteen participants with functional instability, 18 participants with functional and mechanical instability and 18 healthy controls performed 45° sidestep-cutting and 180° turning movements in reaction to light signals. During sidestep-cutting both instability groups displayed significantly lower inversion angles than controls when the trials with the highest maximum inversion angle of each participant were compared. In turning movements, participants with functional instability presented significantly lower average maximum inversion angles than controls as well as higher peroneal activation before foot strike than participants with both functional and mechanical instability. We theorize that the observed changes in movement kinematics of participants with chronic ankle instability are the result of a protective strategy to limit frontal plane ankle joint loading in potentially harmful situations.

Abstract #295 GLP-1 Receptor Agonists and Death From Any Cause in Elderly Patients with Type 2 Diabetes Mellitus: A Post-Hoc Analysis

2018 ◽  
Vol 24 ◽  
pp. 80-81
Author(s):  
Konstantinos Toulis ◽  
Krishna Gokhale ◽  
G. Neil Thomas ◽  
Wasim Hanif ◽  
Krishnarajah Nirantharakumar ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Type 2 Diabetes ◽  
Type 2 Diabetes Mellitus ◽  
Elderly Patients ◽  
Post Hoc Analysis ◽  
Receptor Agonists ◽  
Post Hoc

Abstract #245 Efficacy and Safety of Semaglutide in Elderly Subjects with Type 2 Diabetes: A Post Hoc Analysis of the Sustain 7 Trial

2018 ◽  
Vol 24 ◽  
pp. 51-52
Author(s):  
Vanita Aroda ◽  
Danny Sugimoto ◽  
David Trachtenbarg ◽  
Mark Warren ◽  
Gurudutt Nayak ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Elderly Subjects ◽  
Efficacy And Safety ◽  
Post Hoc Analysis ◽  
Post Hoc

Response-Specific Scalp Distributions in Deception Detection and ERP Correlates of Psychopathic Personality Traits

2004 ◽  
Vol 18 (1) ◽  
pp. 13-26 ◽  
Author(s):  
Antoinette R. Miller ◽  
J. Peter Rosenfeld
Keyword(s):  
Deception Detection ◽  
Event Related Potential ◽  
Psychopathic Personality ◽  
P300 Amplitude ◽  
Group Differences ◽  
Post Hoc Analysis ◽  
P300 Component ◽  
Psychopathic Personality Inventory ◽  
Post Hoc ◽  
First Time

Abstract University students were screened using items from the Psychopathic Personality Inventory and divided into high (n = 13) and low (n = 11) Psychopathic Personality Trait (PPT) groups. The P300 component of the event-related potential (ERP) was recorded as each group completed a two-block autobiographical oddball task, responding honestly during the first (Phone) block, in which oddball items were participants' home phone numbers, and then feigning amnesia in response to approximately 50% of items in the second (Birthday) block in which oddball items were participants' birthdates. Bootstrapping of peak-to-peak amplitudes correctly identified 100% of low PPT and 92% of high PPT participants as having intact recognition. Both groups demonstrated malingering-related P300 amplitude reduction. For the first time, P300 amplitude and topography differences were observed between honest and deceptive responses to Birthday items. No main between-group P300 effects resulted. Post-hoc analysis revealed between-group differences in a frontally located post-P300 component. Honest responses were associated with late frontal amplitudes larger than deceptive responses at frontal sites in the low PPT group only.

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